k3d/share/shaders/k3d_lensflare.sl:16: *   bloomradius, bloomfalloff - control the size & shape of the bloom
k3d/share/shaders/k3d_lensflare.sl:86:		      float bloomradius = 0.5;
k3d/share/shaders/k3d_lensflare.sl:146:	float radius = sqrt(brightness) * 5 * mix(.2, bloomradius, urand());
